Because at the start of a relationship you make out that you're different then you are:
"I'll listen to you. Oh you're very interesting"
"Come back to mine to watch 'It's a wonderful life' - Yeah, I find the end bit very touching"
"Oh, let me get that hair out of your face"
"No, you put the phone down first. No, you put the phone down first!"

Then after about a week or two, you get bored of the facade and say:
"Oh, by the way. I probably should have mentioned this."
Then you rip your shirt open and a vast group of black eels flood out of your abdomin with a roar, alongside spores and smoke and evil.
Then you embarrasingly do your shirt back up, like a flasher who just got arrested. Then you say:
"Oh, I'm sorry. I do apologise for those eels... Shall we put its a wonderful life back on?"

maybe their gaming systems break or malfunction for a few days, being the alpha male that they are, they casually go out and get bitches. When their systems start up again, 2xp>Bitches
gif related, alpha as ****.